Thread:Project:Support desk/Lock wait timeout without restarting server

I host a business wiki on a shared hosting plan and while upgrading an old version to 1.21.1, I'm stuck on "lock wait timeout exceeded" after running the query

CREATE INDEX page_redirect_namespace_len ON `page` (page_is_redirect, page_namespace, page_len)

I can't restart the server, but I also can't find another process using the table.