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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20901a5858f6cfaa562a5cbf047a9202e021a23e64ab93e9590545d517f8d6f' 
  AND token = 'atZpOF/h1kVhJCFRJU1jHt9XHR3F2ahH1b73DcCwViI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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