Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fbaf9db03ac8d73c302cc7a48bb8b6ce0577a0ea52ff42e0f14593d74352b3' 
  AND token = '/bLAeEp90WH/xC0AaUnrx/wwKT8Bwz6C86Tt4oTww0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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