Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad0819c6074a40a1f52f281e3c91383111230aab4410281c89198cd887f78ea' 
  AND token = 'T38zzwXUU/fDRqUxV5Lg1OHRj5MpN4KuePeofTS2qnQ=' 
  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"
    }
  }
}