Solution:
Redirect
OR RedirectMatch
directive from mod_alias
cannot match query string. You must use mod_rewrite
like this:
RewriteEngine On
RewriteCond %{QUERY_STRING} wpsc-product=подвеска-сова-медь-duplicate [NC]
RewriteRule ^/?$ http://domain.com/?page_id=851 [L,R=301,B]
Make sure to keep this rules on top of your .htaccess
.