mysql> explain SELECT * FROM `statistic_pictures` WHERE `id`='101566';
+----+-------------+--------------------+------+---------------+------+---------+                                                                                        ------+-------+-------------+
| id | select_type | table              | type | possible_keys | key  | key_len |                                                                                         ref  | rows  | Extra       |
+----+-------------+--------------------+------+---------------+------+---------+                                                                                        ------+-------+-------------+
| 1  | SIMPLE      | statistic_pictures | ALL  |               |      |         |                                                                                              | 90020 | Using where |
+----+-------------+--------------------+------+---------------+------+---------+                                                                                        ------+-------+-------------+
1 row in set (0.00 sec)