Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2951142a962963939cdb3563c4ee1675f3d97a4e7b1101020af851e5a7ab38' 
  AND token = 'uMNYVuJkRezNBGtxNZlTIPlbmrheOx5rFjSImQYIJSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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