SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0989e5a02c95c3cce83cff09420d5393be3e5e209eb5a8e13d439dc951d85d2' 
  AND token = 'qMvL5exHztCTWaSREW/v7naifDZMWQyLpIOzrDakXoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables