SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad07f25f8036b4c75b899990e4b4481209c174d0a19026f0b5743725f0589ef' 
  AND token = 'xwRbNJdSHZAuhQyMr1IYgXz+OqhYjtPb1bcYQ0wvH3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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