Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df0b6d6bc61fa6cfa092ca82b0fabb28630b5f3b5c565d25c4277d9acb65913' 
  AND token = '1m4+dEvjqExB1KPEcxHvI6vQaCHVKKIEOitasUYbi10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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