SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'cb16a3c43aa66f98ae44bc2044acb9e34d3d273f51b691c9425366e58475cf3b' 
  AND token = '7IjFHyLpcO+T6ytDF3UJJA8Ns5VGvqorZY6pSoIhL40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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