Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299510a52dff0785e2867f7a6aee2221d9814b60b4590747eb38d1269091a307' 
  AND token = 'UzI7j3MSAt689tJ9rA1SNyTCzL5FwugoIC9LOr45ffg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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