Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad76e166284256e1eb02480485fe7541862586f1e82d95702b96a3ee882724a' 
  AND token = 'ldN6cU++zM49BHUtRrW2hcTxwdUl1dxXC6bnKBKzeso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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