SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4431e523c89d54ffc757ad8ae9a4cb185d753a057b9077a4ffb6a759c2346e1' 
  AND token = 'lOmfypKCelGSNBcIPywzxZ4L4QBnF2jFUJVI5TgZyhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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