SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae859ed7689af775fbf930c030b71668abe230b57a20c45d18d600a6cfd55d1d' 
  AND token = '3KJ1X6IW92r/PZ4kHgt4Lvh9T7qwbs09zlUBCKUONis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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