Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e92838889a7de46e65c193ad573589d221a54400681abdc811ccb146129b43' 
  AND token = 'WDiIoy06Z9YvgO8AO+M96KvvvYF5EZsTVrLBCqIz9nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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