SELECT 
  products_pattern_id 
FROM 
  cscart_ab__emd_categories_patterns 
WHERE 
  category_id = 1090

Query time 0.00091

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}