SELECT 
  c.product_details_view 
FROM 
  cscart_products_categories as pc 
  LEFT JOIN cscart_categories as c ON pc.category_id = c.category_id 
WHERE 
  pc.product_id = 65892 
  AND pc.link_type = 'M'

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "pc",
      "access_type": "ref",
      "possible_keys": ["link_type", "pt"],
      "key": "pt",
      "key_length": "6",
      "used_key_parts": ["product_id", "link_type"],
      "ref": ["const", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "pc.link_type = 'M'",
      "using_index": true
    },
    "table": {
      "table_name": "c",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY", "p_category_id"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["category_id"],
      "ref": ["cscart_migrate.pc.category_id"],
      "rows": 1,
      "filtered": 100
    }
  }
}

Result