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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2eafa34483f03daa2af5c27e6c67f7fe5b41a4a3041b9a54f507de93ebe233d' 
  AND token = 'uO0uiS1KuYgjBYTOBbJBjgqE/HY18WUQnKp9a9v4QcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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