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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5352bffa62db63f6c31d2b35b8be28cf8a9ccb7ef5b19e3187edb19c512d5b63' 
  AND token = 'uPom6IwuA/zLR5Lb8IM1fW5CIU0Wjadxbdo7+XrYpDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}