[Howto Fix] Table './eximstats/sends' is marked as crashed and should be repaired

I've tryed to dump my whole databases with mysqldump


mysqldump --all-databases > all_databases.sql

got the error 'Table './eximstats/sends' is marked as crashed and should be repaired when using LOCK TABLES'

'eximstats' is my databasename und 'sends' my tablename.

I've tryed to repair the table with


mysqlcheck -u root --check auto-repair --optimize all-databases

but it no not worked

I've also tryed to repair ith with


mysql> repair table eximstats.sends;