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SELECT 
  video_id, 
  position 
FROM 
  cscart_cp_video_object_links 
WHERE 
  object_id = 31 
  AND object_type = 'A' 
  AND type = 'I' 
ORDER BY 
  position ASC

Query time 0.00014

JSON explain

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