SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d67167ee877358e12ba3c7fdb0673ed4785fbf82964ed2149f190410684fc9d' 
  AND token = 'XDZ38laACe+ZfhD061/kZ2bIvBVNjJ4orwA+BVgJ4cU=' 
  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"
    }
  }
}