describe SELECT * FROM `sketches` WHERE (user_id IS NOT NULL) AND (sketches.deleted_at IS NULL OR sketches.deleted_at > '2009-05-08 18:58:11') ORDER BY created_at DESC LIMIT 16;

+----+-------------+----------+-------+---------------------------+---------------------------+---------+------+-------+-----------------------------+
| id | select_type | table    | type  | possible_keys             | key                       | key_len | ref  | rows  | Extra                       |
+----+-------------+----------+-------+---------------------------+---------------------------+---------+------+-------+-----------------------------+
|  1 | SIMPLE      | sketches | range | index_sketches_on_user_id | index_sketches_on_user_id | 5       | NULL | 13662 | Using where; Using filesort |
+----+-------------+----------+-------+---------------------------+---------------------------+---------+------+-------+-----------------------------+
1 row in set (0.00 sec)


16 rows in set (4.45 sec)