Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1af15f6b1e2752119588a6f731189b20a6c4f67565d022589e45b115e6a0504' 
  AND token = 'E1F7X4qZPfKvNjw0ioo67c9pJ7aXHYhwSUOP2hLqzps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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