SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '69bae6604298717dcd03e3f21953f0fc995c876c1da4ed3f370207fc99a7922b' 
  AND token = 'adzcx2Vleaj/jCWn5vVBcq/7YPebXBZsQPCxG6/Z10Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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