Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12dbab09279ab0e16321e17b6150b7ce60cdc53eb5dc33994dd0e19a5b50641a' 
  AND token = 'kt4yJztAvch4gArGLGXVc973486HbtuSXGAWYyEWxa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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