SELECT 
  p.*, 
  d.*, 
  images.promotion_image_id 
FROM 
  cscart_promotions as p 
  LEFT JOIN cscart_promotion_descriptions as d ON p.promotion_id = d.promotion_id 
  AND d.lang_code = 'uk' 
  LEFT JOIN cscart_promotion_images AS images ON images.promotion_id = p.promotion_id 
  AND images.lang_code = 'uk' 
WHERE 
  p.promotion_id = 206

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "const_condition": "1",
    "nested_loop": [
      {
        "table": {
          "table_name": "p",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["promotion_id"],
          "ref": ["const"],
          "rows": 1,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "d",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["promotion_id", "lang_code"],
          "ref": ["const", "const"],
          "rows": 1,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "images",
          "access_type": "const",
          "possible_keys": ["promo"],
          "key": "promo",
          "key_length": "10",
          "used_key_parts": ["promotion_id", "lang_code"],
          "ref": ["const", "const"],
          "rows": 1,
          "filtered": 100
        }
      }
    ]
  }
}

Result

promotion_id company_id conditions bonuses to_date from_date priority stop stop_other_rules zone conditions_hash status number_of_usages users_conditions_hash updated_timestamp name short_description detailed_description lang_code promotion_image_id
206 1 a:3:{s:3:"set";s:3:"all";s:9:"set_value";s:1:"1";s:10:"conditions";a:1:{i:1;a:3:{s:8:"operator";s:2:"in";s:9:"condition";s:8:"products";s:5:"value";s:575:"23414,23415,23416,23417,23418,23419,23420,23421,23422,23423,23424,23425,23426,23427,23428,23429,23430,23431,23432,23433,23434,23435,23436,23437,23438,23439,23440,23441,23442,23443,23444,23445,23446,23447,23448,23449,23450,23451,23452,23453,23454,23455,23456,23457,23458,23459,23460,23461,23462,23463,23464,23465,23466,23467,23468,23469,23470,23471,23472,23473,23474,23475,23476,23477,23478,23479,23480,23481,23482,23483,23484,23485,23486,23487,23488,23489,23490,23491,23492,23493,23494,23495,23496,23497,23498,23499,23564,23569,23570,23571,23572,23890,23928,23929,23930,23931";}}} a:1:{i:1;a:3:{s:5:"bonus";s:16:"product_discount";s:14:"discount_bonus";s:13:"by_percentage";s:14:"discount_value";s:1:"8";}} 1741471199 1741384800 0 N N catalog products=23414,23415,23416,23417,23418,23419,23420,23421,23422,23423,23424,23425,23426,23427,23428,23429,23430,23431,23432,23433,23434,23435,23436,23437,23438,23439,23440,23441,23442,23443,23444,23445,23446,23447,23448,23449,23450,23451,23452,23453,23454,23455,23456,23457,23458,23459,23460,23461,23462,23463,23464,23465,23466,23467,23468,23469,23470,23471,23472,23473,23474,23475,23476,23477,23478,23479,23480,23481,23482,23483,23484,23485,23486,23487,23488,23489,23490,23491,23492,23493,23494,23495,23496,23497,23498,23499,23564,23569,23570,23571,23572,23890,23928,23929,23930,23931 A 2 1741362683 -8% знижка на продукцію DA_23 uk 674