I think you need to use post__in
. The code will be something like:
$args = array(
'post__in' => array( 1, 2 ),
'post_type' => 'attachment',
'post_mime_type' => 'image',
'no_found_rows' => true,
'posts_per_page' => 2,
'post_status' => 'any'
);
$query = new WP_Query($args);