Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949eb0efb90878513c4146b520df1992051ddb3bbcd1d22fdb04682ce5c7cc3c' 
  AND token = 'CaT5H8HiIU+swa+uAO9KNhBIE8k1WdqxA+bvpR4ug9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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