Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1674711ec82291eecdbdb83a2df90887bd7cb94739ad50d0bb2ff5bc43d68653' 
  AND token = 'xWUYneBFe2rBdn6asbDjDBR91zjIeWV70bNbodyeQzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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