Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3714ff9e19c33eb9461e43d3cce217ecc725ea31829b41ffd3af2431c34ab00' 
  AND token = 'Vn5nIeo81gU0VxE5g166Oyz+twUzc4Wdlk+IEeblWF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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