SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f734b4279776b4b62bf0af023651b79632c89194f51c0863f5264f6c39a1b1a2' 
  AND token = 'J6SWzwmKi/pVYXAgnlwKA0f9rPmqRCIcoHNT36hK5uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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