Electricians

Extension cords are not for permanent use. It will void any insurance claims, and having the dryer 25 feet from the outlet just screens permanent use to an adjustor or inspector.

Even if you find one do not use it. What you have found so far is a guarantee of a fire.

Get an actual sparky to run some conduit on the wall of the garage and move the outlet. It's probably the cheapest option on the table.

But I'm wondering why you want to move the dryer closer to the window and what the dryer vent situation is. There might be a different solution to your problem.

That's a Nema 6-50

Your dryer will need a 30A receptacle, not the 50A you have. Also, you'll be short a crucial wire unless your dryer is old enough to only need 2+ground (you currently have two hots going to a double-pole 50A breaker, and a ground - new dryer will likely need 2 hots, a neutral, and a ground, on a 30a breaker). In other words, you may have to have new wire pulled anyway. Sorry.

Recommend: have electrician look and see about re-pulling the circuit with new Romex, 10/3. Dont just rig a cord unless you at LEAST swap the breaker, too. The wire can be upsized, the breaker and device cannot. If you've got basement access there, it could be a pretty quick job.

Source: am electrician

Who tf downvoted me, im the only actual electrician in this thread, ON THE ELECTRICIAN PAGE. I'm licensed and self-employed, which I'll happily verify with mods. Absurd.

Just move the receptacle.

DON’T use uncertified Amazon import stuff, especially when discussing 50A 220V circuits that run for over an hour straight. Your insurance adjuster will appreciate the denied claim.

No expert, but I think the 50A is just the max based on the rating of that receptacle. If a dryer only pulls 20A, then a 30A extension cord should be enough, right?

I'm not much help here. Just my 2 cents that might expand your available options. Additionally, someone suggesting the wrong thing makes experts more likely to correct them and give the poster the answer they are looking for.

Looks like a nema 5-50 connector

Search for that for extension cords.

Not an electrician - but if you don't see a cable out there, it might be for a good reason. Running copper cable to relocate the outlet from current location to new location might be a solution - and something that -depending on your comfort level and situation, could be doable diy.
Electric dryers I've seen typically have different outlet type. Might be worth looking up their v / amps so you are sure the right gauge wire is running from panel to outlet.

Just as a general comment, it might be worth running normal house wiring to a new location just out of pure economics. A proper extension chord is going to be expensive for 250v 50amps. House wiring, even the heavier gauge stuff for the higher amperage, is much cheaper than an extension chord because wall wiring is a solid wire and doesn't need to be constantly flexible. An extension chord is basically always many stranded wire so that it is more supple, which isn't as capable of carrying current. Thusly, they're always much thicker and with tougher, more expensive casing than static wall wiring as well.

It miiight not be applicable, and maybe the costs have changed in recent years or are different in your area, but always worth considering a cheaper option.

The other comments about possibly needing alternate wiring/plugs might also really impact which option is best. In general, it's worth using only extension chords beefy enough to take any current that the breaker won't trip on. Meaning, if the circuit is 50 amps, a 30 amp chord can become a fire hazard even if the appliance uses less. After all, not everything works perfectly all the time. Don't want one problem of a shorting drier/chord to become a much bigger problem with fire on top.

Princess Auto or Harbor Freight will have one. They're used for welders.