Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f943a7485ba899a8722fc1dc1614b80b837a896bbfe12c2619210a17fba5aaa' 
  AND token = 'lJ7x68jF14VKUPNfx7HcUULuV+9hpTzrP2kRqXU8sH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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