The private key for a wallet created with MEW in 2017 has 57 characters. How fucked am I?

I saved a printed version of this key at multiple different locations. I don't have phrases or .json file.

Is there any chance this key is partial private key and I could brute force the last 7 characters, or did I fuck up and copy the cipherkey? I've accessed the wallet multiple times, then I had the .json file and used a password. I feel confident that I've also accessed the wallet using this key, but not sure if this makes any sense because it's bot 64 digits. The key was printed directly from MEW, but I don't know what I actually printed now.

There's more than $1000 but less than $10000 on this wallet, so I'd really would like to get access to it. If there's zero chance that MEW could have provided a partial private key that worked on their site, not sure if trying to brute force missing 7 characters is worth it.