Explain Query (mysql)

EXPLAIN SELECT * FROM `orders` `t` WHERE (user_id='428679') AND (status='4') ORDER BY delivery_date DESC LIMIT 3

id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t		ref	idx_user_id, ids_status, idx_status_delivery_date_subscription_type, orders_idx_status_droppoint_delivery	idx_user_id	4	const	61	50.00	Using where; Using filesort