Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86287867dfd7f29d1e368d44d7881ffed3f475e757ca10a563b56da587748d3' 
  AND token = 'Do5FdOvqvfvhTCIV3XUjhzrFcQk7FOtyvayxQJxu124=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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