Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '81194cd83758e67b0822f60c9394edeb12c22043819f936f3dfb13fed5ba0769' 
  AND token = '85YCOmMF+IfvAPPOmvlPV2tQa7u8fr1/Vhr+9N0tHds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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