See prisma/prisma#6644 (comment)
Run serverless package and then inspect contents...
➜ prisma-package git:(master) unzip -l .serverless/test.zip| grep query-engine
45213280 01-01-1980 00:00 node_modules/.prisma/client/query-engine-rhel-openssl-1.0.x
37170408 01-01-1980 00:00 node_modules/@prisma/engines/query-engine-darwin
37170408 01-01-1980 00:00 node_modules/prisma/query-engine-darwin
45213280 01-01-1980 00:00 node_modules/prisma/query-engine-rhel-openssl-1.0.x