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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73320480a509e8ee6ff36a4e8db6326af314fc390b0eb52af08bf0fa4d47317' 
  AND token = '0Goj/t9LJGecw4u7YhEbbGFNZSq8CrxqXEc96IlQItU=' 
  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"
    }
  }
}