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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5e83053de8fb9f8317d3b1636006a371e4f529558991fd4c587ece628b96dc' 
  AND token = 'WJBYIvLTVPkGfS9DiFmtX+M5D1OjEG2SaTDr7nfIX4E=' 
  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"
    }
  }
}