Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4393bff083c7015ea745fbf4e7243f7cf108501040c8c55c160e9cf17833f5f' 
  AND token = 'TUw4ETJmepVxzwqKhhKRuiBQ7eOquiiKikfPi6yCf8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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