SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a52f0b899856911df0c117cb284982b4d4032829f29f3bbe393cdc91110437' 
  AND token = 'uebOIgJo/RXOuOiKXaKfkHBmvaipwwgIlTlg2lYhgws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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