Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f42606e3098ce4bc8ef7730385254069529ad80f94faf45d6e4d053463d3b7c' 
  AND token = 'PfND74kUGMQFftAn4b+L/ClU+7+xnqtAQFXuHaw5VIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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