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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 (276421)

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}