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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60c7c313c6e347f3e40a5c5fd91962c425b5d900b5e0ac43e797ed8f210df8f' 
  AND token = '6KSFK+osd9pDqiUnKQAUe13WZDrPL8dHVgF/8/G7I8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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