SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8354234c26f89697763c0317d409cd881ed5e53d84fe7b285b87400a3c4fca17' 
  AND token = 'zaQniQSX4sqvwKRaHNqP912EJNVPEasF7LvBH3/hRgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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