Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa00377cea16119bb8fb7b416df84b0de92f819e7350b5bf3803cc7794b9bc3' 
  AND token = 'BhcPrJvIhFfMvaPWrq96MXdx4yBWxMliz65YUObnGH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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