SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a2b855567252d194f7161dcbe3df3cf773ac9b71821c6187621f8608cfded3' 
  AND token = 'K9RKkwDJRuAOGaKZdplzk8PxdnO/cHZqBBzlItq8pFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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