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Use the proper parameter. Try this:
$post_ids = array( 50, 53, 56, 58 );
$query = new WP_Query('post__in' => $post_ids );
More info
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# Redirection to HTTPS
RewriteCond %{SERVER_PORT} ^80$
RewriteRule ^(.*)$ https://%{SERVER_NAME}%{REQUEST_URI} [L,R]
This rule is in the wrong place. It needs to go before the # BEGIN WordPress comment marker. ie. Before the WordPress front-controller.
Currently, this will result in a redirect to /index.php if requesting HTTP.
# BEGIN SecuPress ...
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