Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6996b54998d7ed1e18d7b8aeb6ad94ee5eb1c8c6b079a8962c5ddabb6d04b2e9' 
  AND token = 's/9cHCzoabmdjkBkyrA9SrSkqRJiXscJMfUAt5rksYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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