Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccef6b14f690126f764987eafa49639339a9ff19458473bdb093ecac258113c9' 
  AND token = 'lNzZGsSFW+K2BCOcmjl66OgSPejW6oY78V5mcYk92Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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