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How do you scan that huge qr code?

In much the same way you might scan this billboard-sized QR code located at the top of a building. Namely, by moving backward. :p

And what's the pass fail rate?

The simple 'Barcode Scanner' app on Android handles it easily. Here's a screenshot of the output: http://i.imgur.com/ELXvBqu.png

Failing that, just use an online reader and upload the PNG image of the QR code. Your pass rate should be 100%.

That is a "dummy" key created for demonstration purposes, right?

Thanks for letting me know. I tried with Qr Droid and it did not recognize it.