Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535b62d112fee942fc4172dc501d9a33f5aa3adf47f1097aa205c48320e9d7db' 
  AND token = 'Stf1hoXerhGVNxuHj3JEYHOpwO29U0CIq5h2U6+fd9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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