Table './DB/cscart_sessions' is marked as crashed and should be repaired (145)
SELECT * FROM cscart_sessions WHERE session_id = '88f9081297ff6959364354c8011f81fe_0_A'
4.2.2 version. Plenty of resources, disk space. One instance server data usage graphs shown usage from average cpu 1-2 to 180-200. Network usage from 1-2mbs to 20mbs.
You'd have to review your system logs to determine if it was the result of a DOS attack or not. Obviously something made mysqld crash and left the table in an unknown state.