function dotspice_menu_item_as_active($classes, $item) {

if( in_array('my-custom-class',$classes) && ( is_category('my-category') /* OR ...*/  ) )   {
    $classes[] = 'current-menu-item';
}

return $classes;
}
add_filter('nav_menu_css_class', 'dotspice_menu_item_as_active', 10, 2);