Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01bcfb46a384719f0c98a3d6fc6d94388027284a6de66949d946d1bbea9d017' 
  AND token = 'uEU1piI3MCeZSMg9n44RC14SMXFFy4ZAsgVCjiU+IXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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