Saint-Genis Bus Station serves the Saint-Genis-Pouilly area of eastern France by road, not by air, so there is no airport lounge to find at QXK itself. This is a bus stop, with none of the terminal infrastructure, check-in desks, security lanes, or airside space, that a lounge would need to exist in the first place.
Saint-Genis-Pouilly sits close to the Franco-Swiss border near CERN, and the practical reason this bus code exists at all is proximity to Geneva Airport (GVA) just across the frontier. Geneva is the real commercial gateway for this area, a genuine international airport with its own lounge landscape, including airline and third-party pay lounges available to eligible travelers, distinct from anything a roadside bus station could offer. Geneva's airport also has a well-known quirk worth knowing if you are coming from the French side: it operates both a Swiss sector and a French sector, so which side you approach from can affect your onward routing, though the lounge facilities themselves sit within the airport's normal terminal areas.
If you are travelling through Saint-Genis on the bus network, treat this stop as ground transport only, a way to reach or leave the Geneva area by road, not as anywhere with its own waiting-room comforts beyond ordinary bus-stop seating. Your actual lounge planning should center on Geneva Airport once you arrive there: check your airline status, fare class, or any lounge-network membership against Geneva's current offerings before you fly, since access terms at any airport lounge can change and are worth confirming close to your travel date rather than assumed in advance.
For anyone routing through this corner of France toward a flight, the honest sequence is bus to border, border crossing, and then Geneva Airport, with any real lounge planning starting only once you are inside that airport's own terminal system rather than at the bus stop itself.