SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671c50823cafb6b8833b23306bd1d1c40d84c364c189803eb139ba400f11f59f' 
  AND token = '9OJM5swV+KMsYgjmuD/H3R2o4wRf0hH1drkVZvQsQAs=' 
  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"
    }
  }
}