I've htaccess file, here you go:

php_flag magic_quotes_gpc off
php_flag register_globals off
php_value max_execution_time 100
ErrorDocument 404 /index.php?key=404
RewriteEngine On

RewriteCond %{HTTP_HOST} !^humor\.mysite\.ru$
RewriteRule .* http://humor.mysite.ru%{REQUEST_URI} [R=301,L]

# Index Page
RewriteRule ^index\.html$ index.php [L]
RewriteRule ^index\.htm$ index.php [L]

# Humor
RewriteRule ^humor([0-9]+)\.html$ index.php?key=humor&id=$1 [L]
RewriteRule ^humor([0-9]+)-([0-9]+)\.html$ index.php?key=humor&af=$1&page=$2 [L]
RewriteRule ^top_week.html$ index.php?key=humor&af=2 [L]
RewriteRule ^top_monthe.html$ index.php?key=humor&af=3 [L]
RewriteRule ^random.html$ index.php?key=humor&af=4 [L]
RewriteRule ^top.html$ index.php?key=traffic&tr=1 [L]

# Common
RewriteRule ^humor/rate\.html$ index.php?key=humor&af=1; [L]
RewriteRule ^add\.html$ index.php?key=humor&add=1; [L]
RewriteRule ^humor/category([0-9]+)\.html$ index.php?key=humor&cat=$1 [L]
RewriteRule ^humor/category([0-9]+)-([0-9]+)\.html$ index.php?key=humor&cat=$1&page=$2 [L]

# Admin Area
RewriteRule ^admin/$ index.php?key=login  [L]
RewriteRule ^admin$ index.php?key=login  [L]

# Default
RewriteRule ^([a-zA-Z_0-9\-]+)\.html$ index.php?key=$1  [L]
RewriteRule ^contest.html$ contest.html [L]

And that i have google confirm apply for website owners, then when i add file inside my root directory and then try to see what inside toss the browser - server redirect me to index.php, however it should show me these file

Order of rules matters. Your last line won't ever get "performed" because previous rule will redirect all .html files to index.php.

Try wrinkles (you are able to securely remove the last line for contest.html):

# Default
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([a-zA-Z_0-9\-]+)\.html$ index.php?key=$1 [L]

Alternatively, add wrinkles after domain redirect rules and before # Index Page block

# Do not do anything for already existing files or folders
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule .+ - [L]