SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7afd54918acb40567640349009d7269d6a24fc328e62de6b9cefffdbab1759' 
  AND token = 'uiudwVXRfGJ1iH6DVoYcoUwLjcFClFuzfDRgVJU8kS8=' 
  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"
    }
  }
}