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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '18c3b96a5271a41630d59f7c0edfdd2d8b7eaf5faf99624229854ea626662f8f' 
  AND token = 'B7rVWbRy8kIt17yFjl/IK8VBGkCcS0NimV1dAjKO3lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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