Cylinder lock and combination of such a lock and key

Cylinder lock comprising:

• a housing,
• a cylinder rotatably provided in the housing and having a first end and a second end, the cylinder extending in a longitudinal direction between the first end and the second end, the cylinder comprising an internal keyway for placing a key corresponding to the lock in the cylinder,
• a locking mechanism that prevents rotation of the cylinder with respect to the housing when the key is not present in the keyway, wherein the locking mechanism comprises multiple pins,
• a blocking element positioned between the first and second end, which blocking element is configured to take a first position wherein the keyway is blocked to prevent complete entry of a key into the keyway and a second position wherein the keyway is unblocked to permit complete entry of a key into the keyway, wherein the blocking element in the first position prevents rotation of the cylinder with respect to the housing,
• the blocking element and each of the pins are of congruent shape,
• the blocking element is at a position of the pin closest to the first end, and
• a configuration device in the housing to configure the blocking element in the first or second position.