Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9a050643a2f7d7b2601a6f45be45b8332731ab757ab5e451df96f17d5bad67' 
  AND token = 'yZYD4KjGyNGXMMwW1VNfV7LDmcrBnbTlkDBr96V1tgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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