Стартирайте MySQLDump без заключващи таблици

Дали --lock-tables=false опция работи?

Според ман страницата , ако изхвърляте InnoDB таблици, можете да използвате --single-transaction опция:

--lock-tables, -l

Lock all tables before dumping them. The tables are locked with READ
LOCAL to allow concurrent inserts in the case of MyISAM tables. For
transactional tables such as InnoDB and BDB, --single-transaction is
a much better option, because it does not need to lock the tables at
all.

Заinnodb DB :

mysqldump --single-transaction=TRUE -u username -p DB