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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481e852a59083b89abf54c16d8e0b30d9fe8d2b81ec7496b33a105f50537e886' 
  AND token = '8Nr4tg8z4/x3WDk8LBoIVv3UYtM7cB8KJQ/xqJrVvgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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