SELECT 
  * 
FROM 
  netting_products_categories 
WHERE 
  product_id = 836

Query time 0.00069

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "netting_products_categories",
          "access_type": "ref",
          "possible_keys": ["pt"],
          "key": "pt",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "ref": ["const"],
          "rows": 9,
          "filtered": 100
        }
      }
    ]
  }
}