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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ff19eb7782b1a46e6697afa5de8aafcfeb7420b5d6122f11f26f3c6f2f1667' 
  AND token = 'RypPwMSvE+53eFGY4R+7T8zf6U7YRFFjzvCO7Mb90Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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