About the table

@gokh The table wp_ctf_feed_locator is created and used by custom twitter feeds plugin. Since it is no long active the table is not needed (if you don’t plan to activate it again), so it can be removed from your database.

May be this article can help you to decide between MyISAM and InnoDB engines
https://www.liquidweb.com/kb/mysql-performance-myisam-vs-innodb/

Thank you