Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514b4dc46a85588680a5558050db61bb185457baea75731deeb51956382ba9f4' 
  AND token = 'XI9uE8LwfeFJZ7WCKzggJPnN61CLtS4ipQzfc/XvGpY=' 
  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"
    }
  }
}