SELECT 
  1 
FROM 
  cscart_sg_price_tracker_history 
WHERE 
  product_id = 169350 
LIMIT 
  1

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.001792605,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_sg_price_tracker_history",
          "access_type": "ref",
          "possible_keys": ["product_id"],
          "key": "product_id",
          "key_length": "4",
          "used_key_parts": ["product_id"],
          "ref": ["const"],
          "loops": 1,
          "rows": 1,
          "cost": 0.001792605,
          "filtered": 100,
          "using_index": true
        }
      }
    ]
  }
}