Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec417df5dc19927f17f4cff1188b4017966767ac3474636a2ce41ad3a8981e93' 
  AND token = 'ZlmWJNCiwo9Bjouu9Vthv67oeUaOEORXZDI8uN1+KRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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