SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2653379fda8f1e5f27148a80fde39f69a91a86d8cec90c9b83d3e745f8189e0f' 
  AND token = 'j2DJCksroKAmqh8bLOLwzIjumt3HCTJf+sGQ0NwQWZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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