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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9661de352039e8f5914f4c62a4b663306e3b52a5ce7f316efb04e9b8b4388683' 
  AND token = '+Vf/S3FRrU8XzJZz+TbLEtvOMBgZts75eCcfOF1/TqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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