Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd199072c4ffaf4c0212b87cf70fe4026b55494abb47b83034c35c14c7b3d1f0c' 
  AND token = 'iMr5d444aJru+85yAjU6ak534fU+Wr4TiYcFTbqJCyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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