htacces 301 redirect old urls with index.php and subfolder to wordpress

Hello, I want to redirect old typo3 urls to the new wordpress site.
I tried almost every code i could found in this forum, but did not work out well.

I want to redirect e.g.
https://www.domain.at/cms/index.php?id=6
to
https://www.domain.at/site1

I tried in htaccess
RewriteCond %{QUERY_STRING} ^id=6$
RewriteRule ^cms/index\.php$ https://www.domain.at/site1/ [R=301]

Rewrite engine is on and the Rule is before the closing wordpress skipping index.php Cond.
looks like its pretty close, but unfortunately not correct.
Can ypu please help me out?