Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '46a93b6049408cd42bd49c767f1c6e708f92c9bf5e7492a4633e29597c4857c7' 
  AND token = '+4tXp+xkatEndXsm3ZeRfyTmxasEhUyH4FKzB0D8bXA=' 
  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"
    }
  }
}