mysql> explain SELECT * FROM bw_thread WHERE thread_parent = 'X';
+----+-------------+-----------+------+---------------+------+---------+------+-------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-----------+------+---------------+------+---------+------+-------+-------------+
| 1 | SIMPLE | bw_thread | ALL | NULL | NULL | NULL | NULL | 27835 | Using where |
+----+-------------+-----------+------+---------------+------+---------+------+-------+-------------+
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