Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86758bbe65debb9f4be25668ebc1da8f93b84c4e363b999233cb63668516b79a' 
  AND token = 'XDxoAgarJCrpxJOLeMaaublK5IAIO+sBkrhYNDx3heg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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