SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b82c193f63f4dbfb482375d1f6df8f41c0615a73c1563dc7777153a6e63933' 
  AND token = 'gv47hE5QODC/sBtmFQfdT8B+G8OyFqFWRmphnKiXmSw=' 
  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"
    }
  }
}