How to make async query in wordpress?

Is any way to make asynchronius query to wordpress, where i can use wordpress functions?

Yes, but it’s:

super fragile and easy to break
a big security problem

I strongly advise against it, and would consider the fix needed to make it work irresponsible to share.

Instead, save yourself a world of pain and use a REST API endpoint, or the official AJAX API, e.g.

// add the endpoint
add_action( 'rest_api_init', function () {
        register_rest_route( 'salk/v1', '/test/', array(
                'methods' => 'POST',
                'callback' => 'salk_rest_test'
        ) );
} );

function salk_rest_test( $request ) {
    // do things here
    // access POST things like this $request['post_data']
    // anything you return gets json encoded and sent back to the browser
}

Placed in a plugin or a themes functions file, then use jQuery.post with the URL example.com/wp-json/salk/v1/test/

Better yet, WordPress already provides a JS endpoint at /wp-json/wp/v2/posts that you can use to create posts from the frontend if you’re logged in

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