SELECT 
  c.option_id, 
  c.product_id 
FROM 
  cscart_product_global_option_links AS c 
  LEFT JOIN cscart_product_options AS a ON a.option_id = c.option_id 
WHERE 
  a.status = 'A' 
  AND c.product_id IN (3518, 47654, 2920, 3408)

Query time 0.00077

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "c",
          "access_type": "range",
          "possible_keys": ["PRIMARY", "product_id"],
          "key": "product_id",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rows": 4,
          "filtered": 100,
          "index_condition": "c.product_id in (3518,47654,2920,3408)"
        }
      },
      {
        "table": {
          "table_name": "a",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["option_id"],
          "ref": ["dev_db.c.option_id"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "a.`status` = 'A'"
        }
      }
    ]
  }
}