SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'cd492b032e6a6f84bc7c43fad5d2ee533a067879dcc1282de2a849351f8fc524' 
  AND token = 'OGFaM/BjdPW1tRjaZjCCqkF9Kyp9B4/mINJIWnaFq8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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