As I saw there are several questions like mine here:
- https://stackoverflow.com/questions/19393179/like-box-does-not-display-posts
- Like Box Code not working
Finally I moved other way - exporting RSS feed via some JS-plugin and inserting it on a page.
Every Facebook page has RSS by url like this:
https://www.facebook.com/feeds/page.php?format=rss20&id=YOUR_PAGE_ID
than you can use jQuery plugin, for example this one - FeedEk jQuery RSS/ATOM Feed Plugin