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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '239cd4be43763bd358cb5c35748bd1c4e1ee7e029be9b0410678933b6e389458' 
  AND token = 'H7TSaJEBRrOvK+mT1i5oT1WH6zV3X4IGJKvwGKvfU7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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