SELECT 
  * 
FROM 
  cscart_twigmo_settings

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_twigmo_settings",
      "access_type": "ALL",
      "rows": 4,
      "filtered": 100
    }
  }
}