Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13213167eec81263c21ca141ca76558e6429099450fa451f75f782eebc960b5' 
  AND token = '9c7p5f6BZhfTnVXGiGyMa1T9RBiNObpkOHkRlBtrkZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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