Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45808a238a6efdab02488ce79cae2d6c5dfe1bdedf0cded0150661236b7e09d3' 
  AND token = 'rOc5rrLOCHVkcoEy6yOiTTv+oBOjX0DxtEjeX/aZg4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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