(1) Log in to your phpMyAdmin or connect to it via your web hosting (cPanel?) backend.
(2) Select the database with the crashed table.
(3) Put a checkmark next to each crashed table.
(4) Select “Repair table” from the “With selected:” drop down at the bottom of the list.
(5) You’re done!

https://wordpress.org/support/topic/wp_options-table-is-marked-as-crashed-and-last-repair-failed-10/