# Pastebin vmPO2rNN
+----+--------------+-------------------+------------+--------+------------------------+----------------+---------+---------------------------+---------+----------+-------------+
| id | select_type  | table             | partitions | type   | possible_keys          | key            | key_len | ref                       | rows    | filtered | Extra       |
+----+--------------+-------------------+------------+--------+------------------------+----------------+---------+---------------------------+---------+----------+-------------+
|  1 | SIMPLE       | cell_mappings     | NULL       | ALL    | PRIMARY                | NULL           | NULL    | NULL                      |       2 |   100.00 | Using where |
|  1 | SIMPLE       | <subquery2>       | NULL       | eq_ref | <auto_key>             | <auto_key>     | 5       | nova_api.cell_mappings.id |       1 |   100.00 | NULL        |
|  2 | MATERIALIZED | instance_mappings | NULL       | ref    | cell_id,project_id_idx | project_id_idx | 767     | const                     | 1262359 |   100.00 | NULL        |
+----+--------------+-------------------+------------+--------+------------------------+----------------+---------+---------------------------+---------+----------+-------------+