SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '29ba5f7cc0b9c5d5dc42f347b21bc44eb280e5821a3ddb15580b72b6fa53774c' 
  AND token = 'ZP8XQo0Ya87bGjr/vKa+SCEjBj4BzRPaInrsDUN3tKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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