If you just want to play , do not waste your time. CS 1.1 is a buggy, unstable mess by modern standards (the hitboxes are atrocious). Download Counter-Strike 1.6 via Steam and use a "Old School" skin pack.
: Never share photos of your physical CD keys online. If a key is visible in a public post, someone else can use it to claim or steal your Steam account through the recovery process.
Typical keys for this era followed a specific pattern (e.g., XXXX-XXXXX-XXXX Modern Accessibility:
In the context of retro gaming, a "CD key" for Counter-Strike 1.1