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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba7440cc9573f5a45078da001bc7b7ae3f541558726bc5aaa926516ab0955f6' 
  AND token = 'TV5f/MLeiePrX8Gu9gPnDf/Bz0qN81XBFZB6wlZYZcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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