SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff730029ca6e494c0c9d1a0dfc870a61b5c9f365fbd7e992ef53c623cd3dd488' 
  AND token = '8BsOh5klqL5Yz9Drw2QCHp+uIW+GY/k0ydmGB0nzSRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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