SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4590c54d2b1d5b95e210984df27bf512912eab00793b75696f4feb837ed73f9' 
  AND token = 'Wz5pkEUZJKCWCZIZdByBnZNzhKyT/TkHjEJnFAlyzU8=' 
  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"
    }
  }
}