Disable skylight for environment

Hey at the moment im building a scene with a cg car and a camera projected environment from a photo. Now i want to light the car with an hdri but not the environment since it already has all the light and shadows on it. the skylights seem not to have lighting channels and so i dont know how to make my environment not recieve light from the sky.

Seems like an easy fix but i cant find a solution anywhere.

Big Thanks in advance