SELECT 
  v.feature_id, 
  v.value, 
  v.value_int, 
  v.variant_id, 
  f.feature_type, 
  fd.description, 
  fd.prefix, 
  fd.suffix, 
  vd.variant, 
  f.parent_id, 
  f.position, 
  gf.position as gposition, 
  f.display_on_header, 
  f.display_on_catalog, 
  f.display_on_product, 
  f.feature_code, 
  f.purpose 
FROM 
  cscart_product_features as f 
  LEFT JOIN cscart_product_features_values as v ON v.feature_id = f.feature_id 
  LEFT JOIN cscart_product_features_descriptions as fd ON fd.feature_id = v.feature_id 
  AND fd.lang_code = 'en' 
  LEFT JOIN cscart_product_feature_variants fv ON fv.variant_id = v.variant_id 
  LEFT JOIN cscart_product_feature_variant_descriptions as vd ON vd.variant_id = fv.variant_id 
  AND vd.lang_code = 'en' 
  LEFT JOIN cscart_product_features as gf ON gf.feature_id = f.parent_id 
  AND gf.feature_type = 'G' 
  INNER JOIN cscart_ult_objects_sharing ON (
    cscart_ult_objects_sharing.share_object_id = f.feature_id 
    AND cscart_ult_objects_sharing.share_company_id = 1 
    AND cscart_ult_objects_sharing.share_object_type = 'product_features'
  ) 
WHERE 
  f.status IN ('A') 
  AND v.product_id = 291 
  AND f.display_on_header = 'Y' 
  AND (
    f.categories_path = '' 
    OR FIND_IN_SET(271, f.categories_path) 
    OR FIND_IN_SET(273, f.categories_path)
  ) 
  AND IF(
    f.parent_id, 
    (
      SELECT 
        status 
      FROM 
        cscart_product_features as df 
      WHERE 
        df.feature_id = f.parent_id
    ), 
    'A'
  ) IN ('A') 
  AND (
    v.variant_id != 0 
    OR (
      f.feature_type != 'C' 
      AND v.value != ''
    ) 
    OR (f.feature_type = 'C') 
    OR v.value_int != ''
  ) 
  AND v.lang_code = 'en' 
ORDER BY 
  fd.description, 
  fv.position

Query time 0.00115

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "temporary_table": {
        "function": "buffer",
        "table": {
          "table_name": "v",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "fl",
            "variant_id",
            "lang_code",
            "product_id",
            "fpl",
            "idx_product_feature_variant_id"
          ],
          "key": "product_id",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "ref": ["const"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "(v.lang_code = 'en')"
        },
        "table": {
          "table_name": "f",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY", "status"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["feature_id"],
          "ref": ["egkcysbp_cscartn.v.feature_id"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "((f.`status` = 'A') and (f.display_on_header = 'Y') and ((f.categories_path = '') or find_in_set(271,f.categories_path) or find_in_set(273,f.categories_path)) and (if(f.parent_id,(subquery#2),'A') = 'A') and ((v.variant_id <> 0) or ((f.feature_type <> 'C') and (v.`value` <> '')) or (f.feature_type = 'C') or (v.value_int <> '')))"
        },
        "table": {
          "table_name": "fd",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["feature_id", "lang_code"],
          "ref": ["egkcysbp_cscartn.v.feature_id", "const"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond((fd.lang_code = 'en'))"
        },
        "table": {
          "table_name": "fv",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["variant_id"],
          "ref": ["egkcysbp_cscartn.v.variant_id"],
          "rows": 1,
          "filtered": 100
        },
        "table": {
          "table_name": "vd",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["variant_id", "lang_code"],
          "ref": ["egkcysbp_cscartn.fv.variant_id", "const"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond(((vd.lang_code = 'en') and trigcond((fv.variant_id is not null))))"
        },
        "table": {
          "table_name": "gf",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["feature_id"],
          "ref": ["egkcysbp_cscartn.f.parent_id"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond((gf.feature_type = 'G'))"
        },
        "table": {
          "table_name": "cscart_ult_objects_sharing",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "159",
          "used_key_parts": [
            "share_object_id",
            "share_company_id",
            "share_object_type"
          ],
          "ref": ["egkcysbp_cscartn.v.feature_id", "const", "const"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "((cscart_ult_objects_sharing.share_object_id = v.feature_id) and (cscart_ult_objects_sharing.share_object_type = 'product_features'))",
          "using_index": true
        },
        "subqueries": [
          {
            "expression_cache": {
              "state": "uninitialized",
              "query_block": {
                "select_id": 2,
                "table": {
                  "table_name": "df",
                  "access_type": "eq_ref",
                  "possible_keys": ["PRIMARY"],
                  "key": "PRIMARY",
                  "key_length": "3",
                  "used_key_parts": ["feature_id"],
                  "ref": ["egkcysbp_cscartn.f.parent_id"],
                  "rows": 1,
                  "filtered": 100
                }
              }
            }
          }
        ]
      }
    }
  }
}