If I will turn off prune mode then I import privkeys and then I would to load blockchain and rescan that. Would I see history and able to see balance of the wallet after whole that steps?
Yes, it should show your balance after fully synced.
Are you sure that the wallet has a balance? Use some block explorer like this
http://blockchain.com/ to check if that wallet has a balance before you proceed running a full node with Bitcoin core and import the private key.
If you don't know the BTC address of that wallet you can use this tool
https://coinb.in/#verify download the page then turn off the internet and paste the private key.
It will show you the address of your private key. Now after that go to blockchain.com or here
https://blockchair.com/ and then paste the address to check if it has a balance.