Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b235e1781e21e0a7a1e9e6e1e32fb0e9cfacf5dd4a4b32d4aec859ae00a2722' 
  AND token = 'a6hKMEwO8YmRrIJt9AJQwPJfAL3oF7uj2ukj48P5834=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}