WP_Query by just the id?

In the codex for WP_Query I see you can query by page_id=7 for pages or by p=7 for posts. Is there a way to get a post of any post type by ID? Like id=7 that will get it no matter if it’s a page, post or custom post type?

Can I force WP_Query to return no results?

I’m working on a website with a search feature that allows users to search through a lot of post meta. There is a specific search pattern that I would like to forcibly return no results for. The WP_Query technically will find results in the database, but I’d like to override that somehow to force it to return no results to trigger the if( $example->have_posts() ) to fail.