Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19897e60e2a3337ab8c22d0f407db37359b8962f408cb405666d20d9a20f1c4' 
  AND token = '32Fj64dl52AIEwVbbDl1ZNvrB9Ax0/En7HUt29KsUsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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