That's neither a spider nor a scorpion (and, of course, not an insect). That's a solifuge, a different group of Arachnida.
The most common Genus of solifugae in India is Galeodes, which resembles the specimen in your photo:
However, narrowing it down to the Genus may be a little bit more complicated.
It's worth mentioning that, despite their frightening appearance, they are not dangerous to humans.