Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f515835797ebdf3dbc03aba81874de89fdd6a8edd85fb369d69e1d9c48fa088' 
  AND token = 'ZmmFx0YuhAxQqf0IklZcBelKU5WsNMU08CqsGa8Xcjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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