Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b9a2fbb12e6ceb4d16a242df97537f1f9fe85023ce90caa194a33209dc3ef6a5' 
  AND token = 'sygfVXW6fj6CFuauVhMBtDgK9SS2KNzoq4os9SShjd0=' 
  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"
    }
  }
}