SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f70ba9714b53b3f49932bb2d313c8fa565c469fa46ebf58f7b4b86795046ca' 
  AND token = 'aF5Zi8HQj+kOOwaJxpxtGmFUNDEMqAw+NoLuGqnzGU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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