Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4494ccb9386a2e6924d998cce49d44f32731cfff5e281caf446cbd2ca8a8b7a5' 
  AND token = 'h0aSppDDeF/KQAwhQfVxfot0pD13tlAMF6KBUIZm200=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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