I've been reading up on cases where the new GPU's have issues with the legacy BIOS of yester years. Even if your PSU could power the system, the motherboard wouldn't allow it to operate and the CPU you own is going to severely bottleneck your GPU if you somehow got the GTX1050 to run on your system. In short it's a lost cause.
On another point, if you must look for
a PSU for the GTX1050 try and look at something with a little more headroom like 450W's. You can even look into Corsair's CX450M or the EVGA 500B(if it's available in your region).