Is it possible to query a category with specified posts?

You should use a custom select query:

$querystr = "
SELECT * FROM $wpdb->posts
LEFT JOIN $wpdb->term_relationships ON($wpdb->posts.ID = $wpdb->term_relationships.object_id)
LEFT JOIN $wpdb->term_taxonomy ON($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id)
LEFT JOIN $wpdb->terms ON($wpdb->term_taxonomy.term_id = $wpdb->terms.term_id)
WHERE ($wpdb->terms.name="sounds-flavors" OR $wpdb->posts.ID IN(12345,12678))
AND $wpdb->term_taxonomy.taxonomy = 'category'
AND $wpdb->posts.post_status="publish"
AND $wpdb->posts.post_type="post"
LIMIT 3
";

Take a look here: https://codex.wordpress.org/Displaying_Posts_Using_a_Custom_Select_Query
Regards