Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3802b0a081bd4cd94ddf3bac93bea9b56d32a329da83b37ab96a1cef1667dcce' 
  AND token = 'P41WWNWqj01dSDcEfzRzPDhIwfDZAuT2xwaoOHyGv6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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