Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68630eefaab25cdba7bf7e8d54fca30970c754159cf5f2083665f8886f52ce7d' 
  AND token = 'okGYTqn5KBEpuIdzV0rGJCCeNA1o5HtEh/s6l5S4zAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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